Oil Pressure Check

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Be careful not to get burned, as engine oil may be hot.
Oil pressure check should be done in "Parking position".

Check the engine oil level.
Remove engine undercover with power tool.
Disconnect harness connector at oil pressure switch (1), and remove oil pressure switch.

Fig 1: Locating Oil Pressure Switch
Courtesy of NISSAN NORTH AMERICA, INC.

CAUTION: Never drop or impact oil pressure switch.
Install the oil pressure gauge [SST: ST25051001 (J25695-1)] (A) and hose [SST: ST25052000 (J25695-2)] (B).

Fig 2: Identifying Oil Pressure Gauge And Hose
Courtesy of NISSAN NORTH AMERICA, INC.
Start the engine and warm it up to normal operating temperature.
Check the engine oil pressure with engine running under no-load.
NOTE: When the engine oil temperature is low, the engine oil pressure becomes high.

Engine oil pressure: Refer to "ENGINE OIL PRESSURE ".

If difference is extreme, check engine oil passage and oil pump for engine oil leakage.
After the inspections, install oil pressure switch as per the following:
1. Remove old liquid gasket from oil pressure switch and the mating surface.
2. Apply liquid gasket and tighten oil pressure switch to the specification.
  Use Genuine RTV Silicone Sealant or an equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".
  
  Tightening torque: Refer to "EXPLODED VIEW ".
3. After warming up engine, check there is no leakage of engine oil with running engine.